PDF malware analysis — malicious · e150f57858a5fc77

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 18:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 39fd10918e6f9615f58b5b86ba4fb0be SHA-1: a1d8a1620120b334c91c6b5633f8aed0ad42755a SHA-256: e150f57858a5fc77ee4db9f062c2707fd7c5af2f6143f28ceb4a203161289be3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://allytemp.ru/uplcv?utm_term=pokemon+black+cheats+for+android PDF link annotation
- https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/pesewinebegufojovofo.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadifuvojo.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a28fc6a487---89616126756.pdfIn PDF document text
- https://marmetal.cevhertemizlik.com/userfiles/files/dewowow.pdfIn PDF document text
- http://satakantaresort.com/user_img/files/pezinobi.pdfIn PDF document text
- https://badoza.net/userfiles/file/85275020706.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/35577539931.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/56821713930.pdfIn PDF document text
- http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28882626571.pdfIn PDF document text
- http://klm-co.ru/foto/ck/files/dilizigafisuwubawafi.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/lr6r1q1r0ko0tn9abphg414ro4/27956924898.pdfIn PDF document text
- http://maginsaatmetal.com/resimlerfiles/lilizufezesapunubesine.pdfIn PDF document text
- https://linkevicius.com/upload/galery/file/6397545391.pdfIn PDF document text
- https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/35369426084.pdfIn PDF document text
- https://misbahelmudii.org/ckfinder/userfiles/files/17996375980.pdfIn PDF document text
- http://sbriz.ru/userfiles/file/girobajomuzalepo.pdfIn PDF document text
- http://mrpokedb.com/uploads/files/libiludoxuvogalat.pdfIn PDF document text
- http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88220567542.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5f71ea4b21847f0db96c97ccd7abc309/viwowam.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/63d41e4e3b2be29f3f3109c2c7177a21/rugapi.pdfIn PDF document text
- http://snieznik.pl/userfiles/file/24229538115.pdfIn PDF document text
- https://bacsionline.net/userfiles/file/48187703320.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f101a5c76bf71b4bcc8d5088f0c72b21/41462967675.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95e298cc---sizosekoxekokasur.pdfIn PDF document text
- http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/31154523657.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c425.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC425	10972 bytes
SHA-256: `249881b36159069adc4e5ea69be4f27a332eca623836373d1a4341d77876d6de`
`font_01_sfnt_off0000dd66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD66	18952 bytes
SHA-256: `288c2420042ac1880ebc99503701e6917c711e349876a840834c81ae72593fc0`
`font_02_sfnt_off00010f18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F18	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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